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Excess of Alkali in cement results in:

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in Basic Civil Engineering by (111k points)
Excess of Alkali in cement results in:

(a) Dry cement paste

(b) Efflorescence

(c) Less plasticity

(d) Unsound cement

I had been asked this question in an interview.

Origin of the question is Ingredients of Cement topic in section Materials for Construction of Basic Civil Engineering

1 Answer

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Right option is (b) Efflorescence

The explanation: Efflorescence is the formation of powdery substance on the surface of masonry or concrete work.  Alkalis usually get carried away by flue gases during heating.  In excess quantity, they result in alkali-aggregate reaction.

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